class_docstr: This class holds the common method for configs.
  
  A config object can be instanciated with keyword arguments and
  updated on call with keyword arguments.
docstr: Can be updated with kwargs
docstr_tok: ["Can","be","updated","with","kwargs"]
code: def __call__(self, **kwargs):
      """Can be updated with kwargs"""
      self._update(kwargs)
  
imports: from copy import deepcopy
  from pygal import formatters
  from pygal.interpolate import INTERPOLATIONS
  from pygal.style import DefaultStyle, Style
label_desc: Use image node_id 2 for calling the BaseConfig obj's underlying member method code with example usage: obj.__call__() without return types